Question

我有以下活动代码：

import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.os.Bundle
import android.os.Handler
import android.support.v7.app.AppCompatActivity
import com.mikhailovskii.androidacademytask8.R
import com.mikhailovskii.androidacademytask8.data.service.ProgressIntentService
import kotlinx.android.synthetic.main.activity_main.*

class ProgressActivity : AppCompatActivity() {

    private val receiver = ActivityBroadcastReceiver(Handler())

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        tv_progress.text="0"

        val intentFilter = IntentFilter(ProgressIntentService.INTENT_ACTION)
        registerReceiver(receiver, intentFilter)

        btn_intent_service.setOnClickListener {
            val intent = Intent(this, ProgressIntentService::class.java)
            startService(intent)
        }

        btn_service.setOnClickListener {
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        unregisterReceiver(receiver)
    }

    //FIXME handler1 seems strange, but passing to constructor doesn't work
    class ActivityBroadcastReceiver (handler1: Handler) : BroadcastReceiver() {

        private val handler = handler1

        override fun onReceive(context: Context?, intent: Intent?) {
            val progress = intent?.getIntExtra(ProgressIntentService.EXTRA_KEY_OUT, 0)
            handler.post { tv_progress.text  = progress }
        }

    }

}

我需要从tv_progress更改BroadcastReceiver中的文本。为此，我在这里添加了Handler。但是电视名称以红色突出显示，而Studio则写道

未解决的参考。由于接收器类型不匹配，以下候选者都不适用

那么，此问题的原因是什么，我该如何解决？预先感谢！

Answer 1

请在下面的行中检查广播的名称：

val intentFilter = IntentFilter（ProgressIntentService.INTENT_ACTION）

无法从广播接收器更改textview中的文本

1 个答案: